Rubber-thread-cutting machine



Jan. 13, 1931. F. w. BoMMER RUBBER THREAD CUTTING MACHINE Filed July 5, 1928 `l() vide a machine of thisfnature which will be Patented Jain. 13, 1931 'I UNlv-TEDysTATES PATENT vclarifie FEED W. EOMMEE, 0E EvERE'r'r, MASSACHUSETTS nUBEEEf'rHnEAn-curcrrlie- MACHINE f My present invention relates to thread cutting machines, and more particularly to a novel machineforv severing, forming or cuttingva rubber thread from cylindrical stock. An important object of the present invention .is to provide a machine whichwill c-ut a rubber thread of predetermined width and thickness-from a substantially solid cylindrical roll of rubber stock.

A furtherobject of the .invention is to proeconomical to manufacture. and operate which will be simple ,and efficient in operation, an which will form or'cut a rubber thread at a relatively high rate of speed.

Another object of the invention consists in the provision of novel cutting instrumentalities for forming such rubber threads. These cutting instrumentalities comprise a rotary knife, adjustable to desired position with relation to the roll of rubber from which it is desired to cuta thread, and also angularly adjustable relatively to the surface ofsaid roll. Cooperating with said rotary knife is a second knife,.arranged at ay predetermined spaced distancecfrom said rotary7 knife, said second knife being zred,` and having a cut ting edge adapted vto sever a thread from said roll, the sides of said thread having already been severed by the rotary knife during rota-l tionv of said roll? This I iXed knife is also adjustable, with the rotary knife, relativelyl tothe roll, to sever a thread of any predetermined thickness.

The rotary knifeiis angularly adjustable, relatively to the surface of th roll and relatively to the fixed knife, to form a thread of predetermined width. These two knives, viz., the rotary knife and the fixed knife, are mov- 0 able in unison progressively along said r l1,

the severing of thread-forming operati' n taking place as said knives move along said roll. 1

`The rotary knifeis adapted to penetrate into said rubber stock to a depth greater than the. thickness of the rubber thread to be` formed from said stock, the fixed knife performing the severing operation at a predetermined depth for the particular rubber thread )being formed.

-4-4 of Fig; 3; and

Application 111ml July s, 192s. serial No. 290,138.

f Coupled with. the novel features above brieiy outlined, is a novel windingmechas nism, to wind the severed thread. This windingmechanism comprises a spool, rotatable by a. friction deviceduring operation of the .1nachine, said friction device bearing directly against the rubber thread as it is wound on binationsof parts, and advantages, will be I hereinafter more fully pointed out, described and claimed.

Referring to the drawings, illustrating a preferred embodiment of the invention,

Fig. 1 is a side elevation of a machine embodying the novel features of my invention,

\ Fig. 2 isa vertical sectional view on the line y 2 2 of Fig. 1; l I Fig. 3 is a vertical sectional view, `on enlarged scale, on thje line 3 3 of Fig; 1;

Fig. 4 is a cross-sectional view Fig. 5 is an enlargedZ fragmentary detail view of the ixed cutting knife. 1 Referring now to the drawings, for a' paron the line A i ticular description of'my invention, its coni struction and operation, 1 designates the rubber stock, which is preferably in the form of a solid roll molded onto a` mandrel 2. This stock 1, as will be readily appreciated, is of considerably greater thickness than the thread which it is intended to cut'therefrom.

The mandrel 2 is mounted between a tail stock 3 and a center 4, said center having a squared end 5 adapted to. seat' in a correspondingly squared recess in one end of thevmandrel 2, Lsaid center 4 also being gripped in the spindle 6 in the chuck 7. The tail stock 3 is operated and adjusted by means of a hand wheel 8, whilethe spindle 6 and chuck 7 are adjusted by means of Ja hand wheel 9. The spindle and 4center 4 are driven through cone pulleys 10 from a suitable. source o power (not shown), thus rotating the mandrel 2 and the substantially solid stock 1 Carried thereby. `It will be noted that the mandrel 2, while rotatable by means of the center 4,/is fixed against longi udinal movement. Mounted on the shaft 1 vof a motor 12 is a circular cutting knife 13, adapted to be rotated by the Inotor 12. The motor 12 is mounted on. a crossslide 14, operable and adjustable by a handle y from the stock 1,`to make a cut 15, so that the knife 13 may be adjusted to and therein of any predetermined depth.

Mounted also on the plate 16 on the crossslide 14'is a holder 17, carrying a knife handle 18 on which is acutting blade 19'. This cuttingr blade 19 has a cutting edge,20 adapted to be presented to the stoclfl as it is being ro tated. A cutting edge 21 may"also be formed on the-blade 19, to facilitate penetration into the stock 1 as the blade is' advanced there? Y along. During operation the -rotary cutting knife or 'Wheel 13 is adapted to penetrate into Y the stock 1 to a greater depth than that predetermined for the thread 22 to'be cut'from the said stock.4 Thus, as illustrated .in Figs. 3 and 4, the rotary knife penetrates to the pointA indicated at 23. The knife blade 19 is Xed 'in a predetermined position with relation to the vrotary blade 13, said position not ybeing as deep vin the stock l as the depth to which the rotary knife penetrates, thus insuring perfect and complete severing of the thread 22 from the stock 1. As the knives advance along the stock 1, the rotary knife 13 forms, by its cutting action, the sides bf ,the thread 22, while the fixed blade 19 forms the back of said thread, as said stock is being rotated during 4the forward `feeding of the knives.

If agnarrower or lWider thread is desired, the rotary knife 13/may be angularly adjusted, relative to thejxed knife blade 19, by means of the rocker plate 24 on which the mo- 'tor 12 and knife 13 are mounted, said rocker plate being adjusted by'moans of the bolts 25.

The cross-,slide 14 is mounted in the saddle 26 movable longitudinally ofthe bed 27 by the lead screw 28 connected through the gears 29 to t-he pulleys 10.- An apron hand wheel 30 is provided if it is desired to move the saddle 26 manually, inthe usual manner. -The sad- "dle 26 is operatively connected to the 1ead-- `screw 28, when power driven, through s nut cam 31'operated by a handle 32, said handle being outside ofthe apron 33.

It will thus be seenthat'when power is transmitted to the pulleys`10, the mandrel 2 and stock 1 will be`rotated, and both the rotary knife 13 and xed blade 19 will4 be moved along the stock 1, to theLright, as viewed in -Fig. 1, said rotary knife 13 being in turn rosplined shaft 37. This shaft has mounted thereon, at one end, a pulley 38 driven, by means'of a belt 39, from the cone pulleys 10. Mounted on the saddle 26 are a pair of stands ards 40 and 41, each of these standards havingI an inwardly and upwardly inclined arm 42 with suitable bearings 43 for theshaftl 37. Mounted on the shaft 37, between the bearings 43, is a sleeve 44 splined'to the shaft 37 by a key or pin 45, said sleeve carrying a pulley 46 on which is a belt 47 connected to a pulley 48l on a sliaft 49, .carried in the outer ends of rocker arms 50 pivotallyniounted on the shaft 37.. Mounted also on theJ shaft 49 ,-and adapted to be rotated' by the belt 47, 1s a fr1ct1on roller 51. The upper ends of the standards 40 and 41 are yoked, as shown at 52, and in these yokes rests a shaft 53 carrymg at one end a worm 54. Splined to the shaft 53 1s a spool 55 on which the rubber thread 22 is to be wound. The friction roller 51 is adapted to rest on the thread 22 and when roller 1s rotated, by the belt 47, said roller will 1n turn impart rotation to said spool 55, winding the thread 22 thereon,y as it is cut from the stock y 1 by the knives 13 and 19.

The lfriction roller 51 belng mounted on the rocker arms 50 will, of course, be elevated as the spool 55 lls with thread, and,

When the spool is filled to its desired capacity, the shaft 53 may be raised from the yokes'52 and the spool 55 removed longitudinally thereof, the roller 51 being first raised on the rocker arms 50, clear of the spool 55, vor eing raised by the spool during the operation of its removal.

To insure level winding of the thread 22 on its spool 55, I'provide., in the bearings 56 on the standards 40 and 41, a shaft 57, earryi. fr a pair ofguide rods 58, between which, the thread 22 passes on its waytothe spool 55. On one end vof the shaft 57 is a collar 59 with a pin 60 thereon, said pin 'entering 'a slot 61 in the yoked end of the lever 62. This lever is pivoted at'its lower edd at 63 to a boss, 64 011 the standard 40 and has thereon ay roller 65 adapted to be engaged by a can] 66 mounted on a pin 67, said pin having, on the end opposite the.cam 66, a pinion 68 adapted to be engaged by a Worm 69 on a vertical shaft 70 having'bearings in lugs or aon thefsha t 53. The worm 54 is, of course,

rotated by the action of Jthe friction roller 30 ,I explained, windingthe thread on the spool and simultaneously the spool 55.

` 51 011 the rubber thread 22 being wound on spring 73, the cam moving the lever 62 to the left Vagainst the tension Vof said coiled spring 73.

The operation of my present novel machine is simple, and will Fbe readily understood, being briefl J described as follows:

Power being t'ansmitted tothe pulleys 10.I the mandrel 2 will be rotated, together with the rubber stock 1 1thereon. ASimultaneously the saddle 26 will be moved longitudinally of the mandrel 2, carrying the moton 12 l.and knives 13 and 19 therewith. The kni'vesywill'cut from the stock 1 the/thread 22 in the manner heretofore described, which thread will be led and secured to the spool 55 for winding thereon. As the thiad is beingcut, the friction roller` l51 will be rotated through the belts 39 and 47, as above causing operation of the guides 58 throughthe medium of the oscillating lever 62. vOn completion of the winding operation,"or when the spool 55is filled yto its desired capacity, said spool .may be removed from the yoked ends of the stand'- ards in the mlanner above described, and a new or em t s ool re laced f whe u o th p y p E re p n e --from a roll ofrubber stock of greater thickmachine will be ready for continued operation, fresh mandrels with the substantially solid rubber stock thereon beingreplaced, of

course, when the stock being' operated on is exhausted.

l stock again and again, until the `entire stock 1 is exhausted.

My present machine is efficient, simple, and- Jrapid of operation, and these Vfacts will instantly appeal to those skilled in this art.

W'hile I have, necessarily described my presentinvention somewhat in detail, it will be appreciated that I may vary the size, shape f and arrangementof parts within reasonably widcf. lilnits without departing from the spirit of the invention I My invention fis further described and-defined in the form of claims as follows: I 1. In a'machine for cutting'rubber threads im ness than the threads to be cut, means for supporting said roll, -a pair of 'knives angularly disposed with relation Ito each other, means to rotatesaid roll with relation to said knives, and means .to haove said knives progressively The knives will be run over the roll.

8. In a machine for cutting rubber threads from arol-l of rubber stock of'greater thick,

froni-,a-roll of rubber stock of greater thicklengthwisethe axis of said roll to out a helical 1 'i thread therefrom.

2. In a machine for cutting rubber threads from a roll of rubber stock of greater thicklness than the threads to be eut, a mandrel fol" supporting said roll, a rotary knife, a knife inv a position relative toi said rotary andmea'ns tomove'sald knlves progresporting said roll, means to rotate said roll, a

rotary knife positioned to penetrate a predetermined distance into said stock, and a knife fixed in a position relative to said rotary knife and adapted to sever a thread from said roll.

4. 'In a machine for cutting rubber threads from a roll of rubber stock of greater thickport and rotate said roll, a rotary knife positioned to penetrate a predetermined distance lengthwise the` axis'dofsaid mandrel t0 ness than the threads to be cut, means to supinto said stock, and a knife fixed in a position relative to said rotary knife and adapted to sever a tix-read from said roll, said fixed knife severing said thread at a depth 'less than the penetration ofsai'd rotary knife.

.5. In a machine for cutting rubber threads from a roll of rubber stock of greater thickness thanthe threads to be dut, means to s'up- .port and rotate said roll, a rotary -knife positionedv to penetrate a ,predetermined distance into'said stock, a knife fixed in a position relative to said rotary knife andA adapted to sever athread from said rol-l, and means to adjust -the inclination of said rotary knife relative to said fixed knife.

6. In a machine for cutting rubber threads ness th the threads to be cut, means to support an rotate said roll, a rotary knife pos1- tioned to penetrate a predetermined distance into 'said stock, a knifefixed in a position relative to said rotary knife and adapted to sever a thread from said roll, and means to move said knives progressively lengthwise the axis of'saidroll.

- 7 In a machine for cutting rubber threads from a roll ofrrubber stock of greater thickness than the threads to be cut, means to support and rotate said roll, a, rotary km positioned to penetrate a predetermined distance int-o said stock. a knifeiixed in a. position relative to said rotary knife and adapted to sever Aa thread from said roll. means to move said knives progressively along 'said roll, and means toadJust ness than the threads to be cut, lmeans to sup-- port and rotate said roll, a rotary knife positioned to penetrate a predetermined distance said knives relatively to said l lar position relative to said rotary knife and adapted to sever a thread from said roll.

9. In a machine for cutting rubber threads from a roll of rrubber stock of greater thickness than the threads to be cut, means to support and rotate said roll, a rotary knife positioned to penetrate a predetermined distance into said stock, and a knife fixed in a substantially right-angled positionv relative to said rotary knife and adapted to sevr a thread from said roll.

10. In a machine for cutting rubber threads from a roll of rubber stock of greater thickness than the thickness of the threads to be out therefrom, a mandrel to support said roll, means to rotate said mandreland said roll, a rotary knife adjusted to penetrate a predetermined distance into said roll, a knife fixed in an angular position relative to said rotary knife and dapted to sever a thread fromsaid roll, and eans to move said two knives in i unison progressively lengthwise the axis of said roll.` v g 11. Apparatus of the character described comprising means for turning an annular rubber body, means for making a spiral cut in the face of the body, and means for making a cut in the side of the body thus to continuously removeA a portion of the body in stripformation.v

In testimony whereof? Irhave signed my name to this specification. f- FRED W. l]? ()Ml'IE]t. 

